WO2000028789A1 - Four a micro-ondes pouvant proteger contre les surintensites un microcontact servant a commander une source d'alimentation en courant continu - Google Patents

Four a micro-ondes pouvant proteger contre les surintensites un microcontact servant a commander une source d'alimentation en courant continu Download PDF

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Publication number
WO2000028789A1
WO2000028789A1 PCT/KR1999/000001 KR9900001W WO0028789A1 WO 2000028789 A1 WO2000028789 A1 WO 2000028789A1 KR 9900001 W KR9900001 W KR 9900001W WO 0028789 A1 WO0028789 A1 WO 0028789A1
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WO
WIPO (PCT)
Prior art keywords
microwave oven
closing
opening
high voltage
microswitch
Prior art date
Application number
PCT/KR1999/000001
Other languages
English (en)
Inventor
Chul Kim
Yong Woon Han
Seong Deog Jang
Han Jun Sung
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to US09/831,314 priority Critical patent/US6664523B1/en
Publication of WO2000028789A1 publication Critical patent/WO2000028789A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6414—Aspects relating to the door of the microwave heating apparatus
    • H05B6/6417—Door interlocks of the microwave heating apparatus and related circuits

Definitions

  • the present invention relates to a microwave oven, and more particularly to a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source, which is capable of being prevented from holding the previous status of contacts in a microswitch caused by the large amounts of current which are remaining when using direct current.
  • FIG. 1 shows a microwave oven for heating/cooking food using microwaves.
  • the microwave oven contains a case 20 for forming a cooking chamber 22, a door 21 for opening/closing the cooking chamber 22, a tray 24 being installed in the cooking chamber 22, and a panel 25 for controlling operations of the microwave oven.
  • FIG.2 is a partial cutaway view of FIG. 1.
  • a pair of latch hooks 28a, 28b are installed in the door 21, and catch openings 27a, 27b are formed corresponding to each latch hook 28a, 28b at a front plate 26 of the case 20. If the door 21 is pushed shut, the latch hooks 28a, 28b will engage the catch openings 27a, 27b to hold the door 21 shut.
  • a device chamber (not shown).
  • a magnetron for generating microwaves
  • a high voltage transformer HVT for generating a high voltage supplied to the magnetron, and so on. In supplying an AC power to the high voltage transformer HVT, this high voltage transformer HVT generates a predetermined high voltage to drive the magnetron. Then, the magnetron radiates microwaves of about 2,450MHz frequency to heat/cook food.
  • microswitches MSI , MS2, MS3 are installed at the back side of the front plate 26 of the case 20.
  • FIGS. 3a, and 3b are schematic diagrams and symbols of each microswitch MSI , MS2, MS3, respectively.
  • the microswitches MSI , MS2, MS3 have a slight interval at the contacts, and a mechanism of a snap action.
  • the microswitches MSI , MS2, MS3 have a contact mechanism to open/close by the determined operation and force in a sealing case, and is a small switch for arranging a pushing mechanism of the actuator switch located on the outside of the case.
  • the microswitch is one of the contact type detectors, which detects something contacted according to releasing the inside contacts when something 6 closes to a push button 1 , and begins to push the push button 1 , and applies more than a predetermined force F to the push button 1.
  • the reference numeral 2 is a movable spring
  • the reference numeral 3 is a movable contact
  • the reference numeral 4 is a fixed contact b
  • the reference numeral 5 is a fixed contact a.
  • COM, NO, and NC are a common terminal, a normally open terminal, and a normally closed terminal, respectively.
  • the contact a 7 is a point of contact which conducts first when the microswitch is operated, and which connects the common terminal COM into the normally open terminal NO.
  • the contact b 7 is a point of contact which conducts when the microswitch is not operated, and which connects the common terminal COM into the normally close terminal NC.
  • the microswitches MSI , MS2, MS3 have each operating button 31 , 32, 33, respectively.
  • a pair of movable members 29a, 29b At the back side of the front plate 26 are installed a pair of movable members 29a, 29b to adjoin the catch openings 27a, 27b. Then, the movable members 29a, 29b are fixed for pivoting by each pin 23a, 23b, and are fixed elastically by each spring 41a, 41b.
  • the microswitches MSI, MS2, MS3 are operated by the latch hooks 28a, 28b which are inserted in the catch openings 27a, 27b. That is, when the movable members 29a, 29b are pushed by each latch hook 28a, 28b, the movable members 29a, 29b are rotated against the elasticity of the springs 41a, 41b. Therefore, the operating button 31 is pushed by the upper movable members 29a, and the operating buttons 32, 33 are pushed by the lower movable members 29b, respectively.
  • An AC/DC type microwave oven comprises an AC driving load 30, a DC driving load and DC/AC converting part 40, and a microwave oscillator 50.
  • the AC driving load 30 is driven by an AC input power.
  • the DC driving load and DC/AC converting part 40 includes the DC driving load being driven by a DC input power, and the DC/AC converter converting the DC input power into an AC power.
  • the microwave oscillator 50 is supplied by only one of the AC input power or the DC/ AC power converted by a DC/AC converter, and generates microwaves.
  • the AC driving load 30 is driven by alternating current, which includes a lamp and a fan motor, etc.
  • the microwave oscillating part 50 includes a high voltage transformer HVT which receives the AC power, a high voltage condenser HVC, a high voltage diode HVD, and a magnetron MGT.
  • the microwave oscillating part 50 is described the same way as shown in FIG. 1. Therefore, according as the AC power source supplies alternating current to the AC driving load 30, and the DC power source supplies direct current to the DC driving load and DC/AC converting part 40, respectively, the conventional AC/DC type microwave oven is operated.
  • the DC driving load and DC/AC converting part 40 is designed for the user to use the AC/DC type microwave oven out-of- doors, using the power source of an automobile battery.
  • the common AC power source supplies small amounts of current within 15A, but the battery of the automobile using DC supplies large amounts of current from 50A to 70A.
  • the microswitches MSI , MS2 have the possibility of a faulty operation.
  • the contact of the microswitches MSI, MS2 can remain in there contacting status.
  • the operating buttons 31, 32 of the microswitches MSI , MS2 can remain in their depressed status.
  • the primary switch PD and secondary switch SD of the DC driving load and DC/AC converting part 40 are held in their closed status, and then current is supplied to the DC driving load and DC/AC converting part 40, so the AC/DC type microwave oven has the problem of encountering a malfunction.
  • the present invention has been made to overcome the above described problem of the prior art, and accordingly it is the first objective of the present invention to provide a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source. It is the second objective of the present invention to provide a microwave oven for heating/cooking food safely by preventing overcurrent of a microswitch for controlling a DC power source.
  • the present invention provides a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source.
  • a microwave oven having a case forming a cooking chamber, a door for opening/closing the chamber, a high voltage transformer for generating a high voltage, and a magnetron for generating microwaves driven by the high voltage being outputted from the high voltage transformer, a microwave oven comprising: means for detecting opening/closing of the door; means for controlling for outputting a driving signal corresponding to the detected result; and means for opening/closing for controlling a power source supplied to the high voltage transformer according to receiving the driving signal.
  • the means for detecting is a microswitch which is a detector for detecting the opening/closing of the door.
  • the means for opening/closing is an electromagnetic relay for controlling an opening/closing of an input power source to open/close a contact according to the driving signal, wherein the relay is an electromagnetic relay for controlling a supply of large amounts of current from 50A to 70A.
  • an interlock device of a microwave oven In a microwave oven having a case forming a cooking chamber, a door for opening/closing the chamber, a high voltage transformer for generating a high voltage, and a magnetron for generating microwaves driven by the high voltage being outputted from the high voltage transformer, an interlocking device of a microwave oven comprising: microswitches for detecting opening/closing of the door; microcomputer for outputting a driving signal corresponding to the detected result; and a relay for opening/closing for controlling a power source supplied to the high voltage transformer according to receiving the driving signal.
  • the relay is an electromagnetic relay for controlling a supply of large amounts of current from 50A to 70A.
  • the present invention provides a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source.
  • the microwave oven comprising: a DC circuit part for converting direct current supplied by a DC input power source into alternating current, and for supplying the converted alternating current; an opening/closing means for connecting between the DC input power source and the DC circuit part; a current dividing means being connected to the means for opening/closing, and for dividing a part of current supplied by the means for opening/closing when the means for opening/closing is switched on; and a microwave oscillating means for being driven by an output voltage of the high voltage transformer, and for generating microwaves.
  • the current dividing means is a relay connected to the opening/closing means in parallel.
  • the present invention further comprises resistors for being connected to the opening/closing means and/or the relay current dividing means in series, respectively, and for regulating each rate of current through the opening/closing means and the relay, respectively.
  • the present invention provides a device for preventing overcurrent of a microswitch comprising: a microswitch for opening/closing the connection between DC input power source and a DC circuit part being supplied direct current; and a current dividing means being connected to the microswitch in parallel, and for dividing a part of current through the microswitch when the microswitch is switched on.
  • a microwave oven is capable of preventing overcurrent of a microswitch by using a relay, and so on.
  • a microwave oven can be heating/cooking food safely according to being prevented from a holding of the previous status of contacts in a microswitch by preventing overcurrent of a microswitch for controlling a DC power source.
  • FIG. 1 is a cutaway view of a conventional microwave oven
  • FIG. 2 is a partial cutaway view of FIG. 1 for explaining a microswitch and the operation of the opening/closing of the conventional microwave oven;
  • FIGS. 3a and 3b are a schematic diagram and symbols of the microswitch, respectively;
  • FIG. 4 is a block diagram of a conventional AC/DC type microwave oven
  • FIG. 5 is a block diagram of a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source according to the first embodiment of the present invention
  • FIG. 6 is a block diagram of a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source according to the second embodiment of the present invention
  • FIGS. 7a and 7b are a block diagram and symbols of relays of FIGS. 5 and 6, respectively;
  • FIG. 8 is a schematic diagram of a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source according to the first embodiment of the present invention
  • FIG. 9 is a schematic diagram of a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source according to the second embodiment of the present invention.
  • FIG. 5 is a block diagram of a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source according to the first embodiment of the present invention.
  • this microwave oven according to the first embodiment comprising: microswitches 100, 110 for detecting the opening/closing of the door; microcomputer 150 for controlling being outputted a driving signal corresponding to the detected result; and a relay 220 for opening/closing for controlling a power source supplied to the high voltage transformer according to receiving the driving signal; a DC/AC converter 300 for converting direct current supplied by a DC input power source into alternating current, and for supplying to the high voltage transformer; and a microwave oscillator 400 being driven by an output voltage of the high voltage transformer, and for generating microwaves.
  • the relay 2 is a block diagram of a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source according to the first embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source according to the first embodiment of the present invention.
  • This microwave oven according to the first embodiment comprises an AC circuit part 500, a DC circuit part 600, and a microwave oscillating part 400.
  • the AC circuit part 500 supplies a high voltage transformer 410 with alternating current by an AC input power source
  • the DC circuit part 600 supplies to the high voltage transformer 410 which converts alternating current after converting direct current supplied by a DC input power source into alternating current
  • the microwave oscillating part 400 generates microwaves by means of the output voltage of the high voltage transformer 410.
  • the DC circuit part 600 uses relays 221, 222 for opening/closing a DC input power source. The opening/closing of the door is detected by microswitches 100, 110, microcomputer produces the driving signal to the relays 221, 222 corresponding to the detected result, so the relays 221 , 222 can open/close the DC input power source
  • the microwave oven contains microswitches MSI, MS2, MS3 for controlling operations of each first switches PA, PD, each second switches SA, SD, and each monitor switches MA, MD.
  • the first microswitch MSI operates along with the first switches PA, PD
  • the second microswitch MS2 operates along with the second switches SA, SD
  • the third microswitch MS3 operates along with the monitor switches MA, MD, respectively.
  • the high voltage transformer 410 contains many coils 411 , 412, 413, 414, and is driven by the AC circuit part 500 or the DC circuit part 600 to generate a high voltage of about 2,000V.
  • the AC circuit part 500 contains the first lamp LI , the first fan motor FM1 , and the first and second switches PA, SA and the monitor switch MA for controlling an AC power.
  • first and second switches PA, SA are switched on and the monitor switch MA is switched off, the first lamp LI and the first fan motor FM1 are driven, and the AC input power source supplies alternating current to the high voltage transformer 410 simultaneously.
  • the high voltage transformer 410 generates a high voltage
  • a magnetron MGT generates microwaves by means of the high voltage.
  • the DC circuit part 600 contains the second lamp L2, the second fan motor FM2, a DC/AC converter 300 for converting direct current supplied by DC input power source into alternating current, and the relays 221, 222 along with a monitor switch MD for controlling a DC power.
  • the DC/AC converter 300 contains a commutator 330, a commutator motor M for rotating the commutator 330, and two pairs of brushes 321, 322, 323, 324 being contacted to the outer circle of the commutator 330.
  • Two pairs of brushes 321, 322, 323, 324 consist of one of input brushes 321 , 323 being connected to direct current, and one of output brushes 322, 324 being connected to the high voltage transformer 410.
  • the pair of input brushes 321 , 323 is contacted to the outer circle of the commutator 330, and supplies direct current to the commutator 330.
  • the pair of output brushes 322, 324 is contacted to the outer circle of the commutator 330 and converts direct current supplied by the input brushes 321, 323 into alternating current, when the commutator 330 is rotated.
  • microswitches MSI, MS2, MS3 are installed at the back side of the front plate 26 of the case 20.
  • the microswitches MSI, MS2, MS3 have each operating button 31, 32, 33, respectively.
  • At the back side of the front plate 26 is installed a pair of movable members 29a, 29b to adjoin the catch openings 27a, 27b. Then, the movable members 29a, 29b are fixed for pivoting by each pin 23a, 23b, and are fixed elastically by each spring 41a, 41b.
  • the microswitches MSI , MS2, MS3 are operated by the latch hooks 28a, 28b which are inserted in the catch openings 27a, 27b. That is, when the movable members 29a, 29b are pushed by each latch hook 28a, 28b, the movable members 29a, 29b are rotated against the elasticity of the springs 41a, 41b. Therefore, the operating button 31 is pushed by the upper movable member 29a, and the operating buttons 32, 33 are pushed by the lower movable member 29b, respectively.
  • the AC/DC type microwave oven is operated.
  • the microswitches 100, 110 detect the opening/closing of the door
  • microcomputer 150 produces the driving signals to the relays 221, 222 corresponding to the detected results
  • the relays 221 , 222 are to open/close the supply of the DC input power source.
  • the microwave oven does not use the microswitches 100, 110 directly to control the supply of the DC input power source, but use the relays 221, 222 capable of not generating the holding of the previous status of contacts, instead of the microswitches 100, 110. Therefore, the microwave can be used more safely.
  • FIG. 6 is a block diagram of a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source according to the second embodiment of the present invention.
  • This microwave oven comprising: a DC/AC converter 300 for converting direct current supplied by a DC input power source into alternating current, and for supplying the converted alternating current to the high voltage transformer; microswitches 100, 110 for opening/closing a connection between the DC input power source and the DC/AC converter 300; current dividers 200, 210 being connected to the microswitches 100, 110 in parallel, and for dividing a part of current supplied by the microswitches 100, 110 when the microswitches 100, 110 are switched on; and a microwave oscillator 400 for being driven by an output voltage of the high voltage transformer, and for generating microwaves.
  • the microswitches 100, 110 are operated by the door for opening/closing the cooking chamber.
  • the current dividers 200, 210 include relays being connected to the microswitches 100, 110 in parallel, and include resistors being connected to the microswitches 100, 110 and/or the relays 200, 210 in series.
  • the resistors can regulate rates of current through the microswitches 100, 110 and the relays 200, 210.
  • FIGS. 7a and 7b are a block diagram and symbols of relays of FIGS. 5 and 6, respectively.
  • the relay called an electromagnetic relay has a hinge-type relay and a plunger- type relay, etc. Because the characteristic of isolation of the plunger-type relay is excellent, and the capability of contact is large, the plunger-type relay is used as an electromagnetic contactor, an electromagnetic switch, and an auxiliary relay of power type, etc.
  • a moving-iron is moving linearly in an electromagnetic coil according to being excited or being degaussed by the electromagnetic coil, and a mechanism of contact being connected to the moving-iron is opened/closed by using the movement of the moving-iron.
  • the exciting represents flowing current, while the degaussing represents not flowing current.
  • the reference numeral 9 is a coil
  • the reference numeral 10 is an independent contact
  • the reference numeral 11 is a normally open terminal
  • the reference numeral 12 is a normally closed terminal.
  • contact a 13 means the status of connecting the independent contact 10 to the normally open terminal 11 when current flows through the coil 9.
  • Contact b 13 means the status of connecting the independent contact 10 to the normally closed terminal 12 when current is not flowing through the coil 9.
  • FIG. 9 is a schematic diagram of a microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source according to the second embodiment of the present invention.
  • This microwave oven according to the second embodiment comprises an AC circuit part 500, a DC circuit part 600, and a microwave oscillating part 400.
  • the AC circuit part 500 supplies a high voltage transformer 410 with alternating current by an AC input power source
  • the DC circuit part 600 supplies to the high voltage transformer 410 which converts alternating current after converting direct current supplied by a DC input power source into alternating current
  • the microwave oscillating part 400 generates microwaves by means of the outputting voltage of the high voltage transformer 410.
  • the operation of the AC circuit part 500 and the microwave oscillating part 400 are the same as above-described in the first embodiment.
  • the opening/closing of the DC input power source in the DC circuit part 600 is accomplished by means of the microswitches 100, 110. Therefore, this microwave oven can prevent the holding of the previous status of large amounts of current in the microswitches 100, 110 by using differentiated current dividers 201, 211.
  • the microwave oven according to the second embodiment contains the first relay 201 , and the second relay 211 being connected to the microswitches 100, 110 in parallel.
  • the relays 201, 211 are turned on when the microswitches 100, 110 are turned on, respectively. Accordingly, at least a part of current through the microswitches 100, 110 is flowing through the relays 201 , 211.
  • the second embodiment according to the present invention uses the relays 201 , 211 which are the means for dividing a part of current through the microswitches 100, 110, and uses a device of a non-contact switch, etc.
  • This microwave oven can heat/cook food by using both the DC input power source and the AC input power source. Then, this microwave oven contains a differentiated selecting switch (not shown) to operate selectively the DC circuit part 600 or the AC circuit 500.
  • each resistor 102, 112, 202, 212 is connected to the relays 201 , 211 and the switches PD, SD in series.
  • This resistors 102, 112, 202, 212 are used for current-limiting.
  • the rates of current through the microswitches 100, 110 and the relays 201, 211 are capable of being regulated.
  • the microswitches 100, 110 are capable of being prevented easily from the holding of the previous status of contacts.
  • this microwave oven adapts the relays 201, 211 for preserving the first and second microswitches MSI , MS2, and adapts an additional relay for preserving the third microswitch MS3 as shown in FIG. 2.
  • this microwave oven according to the present invention is capable of preventing from the holding of the previous status of contacts in the microswitches by being prevented the overcurrent of the microswitches. Accordingly, this microwave oven is capable of being prevented from faulty operations of the microswitches, and the heating/cooking of the microwave oven is accomplished safely.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Ovens (AREA)

Abstract

L'invention concerne un four à micro-ondes. Dans une forme de réalisation, ce four à micro-ondes présente un boîtier formant une chambre de cuisson, une porte pour ouvrir ou fermer cette chambre, un tranformateur haute tension pour générer une haute tension, et un magnetron générant des micro-ondes sous l'effet de la haute tension produite par le tranformateur haute tension. Des microcontacts détectent une action d'ouverture ou de fermeture de la porte et, en fonction de ce qui est détecté, un micro-ordinateur envoie un signal de commande à des relais qui ouvrent ou ferment une source d'alimentaion en courant continu d'entrée alimentant le tranformateur haute tension. Dans une deuxième forme de réalisation, le four à micro-ondes de l'invention comprend un composant de circuit à courant continu qui convertit le courant continu provenant d'une source d'alimentation en courant continu d'entrée, un magnetron qui génère des micro-ondes au moyen du courant alternatif produit par le composant de circuit à courant continu. Le raccordement entre la source d'alimentation en courant continu d'entrée et le composant de circuit à courant continu est contrôlé par des microcontacts. Des relais sont reliés aux microcontacts en parallèle, puis le maintien du précédent état des contacts dans les microcontacts est empêché en conséquence, du fait de la protection de chaque microcontact contre une éventuelle surintensité du courant. On assure ainsi un fonctionnement plus sûr du four à micro-ondes.
PCT/KR1999/000001 1998-11-11 1999-01-04 Four a micro-ondes pouvant proteger contre les surintensites un microcontact servant a commander une source d'alimentation en courant continu WO2000028789A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09/831,314 US6664523B1 (en) 1998-11-11 1999-01-04 Microwave oven capable of preventing overcurrent of a microswitch for controlling a DC power source

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1998/48170 1998-11-11
KR1019980048170A KR100341288B1 (ko) 1998-11-11 1998-11-11 직류전원을단속하는마이크로스위치의과전류를방지할수있는전자렌지

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WO2000028789A1 true WO2000028789A1 (fr) 2000-05-18

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WO (1) WO2000028789A1 (fr)

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KR100341288B1 (ko) 2002-10-25

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